# Calculate The Cutting Length of The Chairs Ba

Today in this article I will find the Calculate The Cutting Length of Chairs Bar | Parts Of Chair Bar | Why Provide The Chair Bar.

### Why provide the Chair Bar?

Some basic purposes for using chair bar in footing and slab.

The main purpose of the chair bar is to manage the gap between the top main and bottom main bar.

This is to Provide vertical support between the top bar and the bottom bar.

The chair bar is used in the Tension Zone.

The minimum diameter of the Chair Bar is not less the 12mm.

The Chair Bar is Provided for the Reduction of Bends on the top bar and bottom bar.

### Parts Of Chair Bar

The chair bar has the parts

### 1-Head of the Chair Bar

This is the top portion of the chair bar is called the head of the chair bar. which is come below the top of the main bar. the total length of the head is 2×spacing+2×50. the constant value of 50.

### 2-Height of the Chair Bar

The vertical portion of the chair bar is called the height of the chair bar. this is mane parts is important to calculation.

Height of chair bar= total depth-bottom and top C.C-Top main and distribution bar-bottom main bar

### 3-Leg of the Chair Bar

The bottom part of the chair bar is called the leg of the chair bar. This portion is coming at the top of the bottom main bar. the total length of the leg is 2×spacing +50.the constant value of 50.

### Given Data

Dia of Distribution Bar=16mm

Dia of Main Bar=16mm

Spacing =150mm

Dia of Chair Bar=12mm

Concrete Cover =50mm

### Length of The Leg of The Chair

Leg Of The Chair=2×spacing+50

Leg Of The Chair=2×150+50=350mm

The total length of the Chair=350×2=700mm

### Length of The Height of The Chair

Height of The Chair =total depth-bottom and top C.C-Top main and distribution bar-bottom main bar

Height of The Chair =1200-50-50-2(16)-16

Height of The Chair =1200-100-32-16=1052mm

Total Height of The chair =1052×2=2104mm

Now

### Cutting Length of Chair Bar

Total cutting Length Of Chair Bar=2×leg+2×height+head-4×90ºbends(2d)

Total cutting Length Of Chair Bar=2×350+2×2104+400-4×(2×12)

Total cutting Length Of Chair Bar=700+4208+400-96=5212mm=5.212m

THANKS

### Raja Numan

Hi, My name is Engr. Raja Numan author of Engineering Information Hub and I am a Civil Engineer by Profession and I've specialized in the field of Quantity Surveying, Land Surveying as QC Engineer in national and multinational companies of Pakistan & Saudi Arabia.

1. Ashwani kumar Sharma says: